Pump control



Oct. 16,` 1928.

A. C. ATTENDU PUMP CONTROL Filed Jan. 17, 1925 2 sheets-shewv 1 I .will mh mi". EVIL [.l, l.. f.. QM., QN 7l f.

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oct. 16, 1928. 1,687,604

` A. C. ATTENDU PUMP CONTROL Filed Jan, 17, 1925" n 2 Sheets-Sheet 2 77 K 7@ 9'/ L Z I 76 Z2 50 5;, f f5 y@ Patented @et 16, ,192555.

STaTES Annan e. Ammann, or normanna, donano, canapa.

Application led January the part of the attendant.

lVhen regulating the pump disclosed in the aforesaid prior application to vary the time or the quantity of fuel delivery, it isA necessary to change the angular setting of l5 the cam to give a dierent time of delivery or to maintain the same timingy for varying quantities ofv fuel delivered. This setting of the shaft to properly position the cams must be performed by the attendant and requires a certain expenditure of effort and a very complicated mechanism Which I have found to be undesirable and which I now propose to eliminate by the provision of hydraulic mechanism for doing such Work.

W`hile various hydraulic mechanisms may be adopted/for this purpose, I prefer and p rovide a mechanism utilizing as its motive fluid surplus oil pressure developed by thepump and Which after passing through the hydraplic mechanism is returned to the source of fuel supply.

Briefly stated, the hydraulic mechanism of my invention comprises a. cylinder, a piston operating in the cylinder, suitable instrumentalities actuated by the movement of the piston and functioning to control both the.

setting of the pump cam shaft and the effective stroke of? the pump delivery plungers. The pump is provided with a reservoir 1n which is maintained a supply of oil under a predetermined pressure and `approximately constant by means of a relief valve through which excess oil is conducted from the reservoir to the aforesaid cylinder, and through a by-pass, to the tank or other source of supply. This by-pass is equipped with a contiol valve which serves to cause the oil to accumulate in or be discharged from the cylinder, thus regulating the'movement of ou the piston to effect the desired control o the pump.

Referring to the drawings: Fig. 1 is a side elevation of a pump equipped with my invention, the elements of l?, 1925. Serial Nm 3,135.`

the pump being shown in dotted outline.

Fig. 2 is a top plan view of the controlling means.

Fig. 3 is a transverse sectional View through the pumps showing the control means and cooperating pump elements in elevation.

Fig. 4 is a sectional view of the control va ve.

The pump 10 is described in my prior application previously referred to and hence for present purposes may be'briefly treated as follows: The pressure plungers 11 function to maintain the reservoir 12 supplied With oil under a definite predetermined pressure governed by a relief valve 13 situated at the top of the reservoir. On the downward stroke of the measuring and delivering plungers 14 oil is drawn from the reservoir into the measuring cylinders 15. On the upward stroke of the plungers 14 the oil is forced from the cylindersl. through the injector line 16 to the engine cylinders. The plungers 14 are actuated by cams 16 fixed on the cam shaft 17.

The quantity of fuel delivered by the plungers 14 may be regulated by varying the effective stroke of said plungers. This is accomplished 'through the instrumentality of a shaft 18 carrying pairs of arms 19. The arms of each pair extends on opposite sides of one of the plungers 14 in supporting engagement with projections 20 carried by the 'plungers so that b turning the shaft in the proper direction tlie arms and plungers 14 will'be raised or lowered with respect to the operating cams 16.

In order to vary the time of fuel delivery or to maintain the same timing for varying quantities of fuel delivered, it is necessary that the shaft 17 be turned on its axis to change the angular setting of the cams 16. This is accomplished through the instrumentality of a sleeve 21 keyed to slide on shaft 17 andl provided with external spiral splines 22 meshing with corresponding internal splines 23 formed on a sleeve 24 telescoping the sleeve 21. Sleeve 24 is mounted to slide relatively to the sleeve 21 by means of a housing 24". lVith this arrangement it Will be apparent that when either sleeve is moved longitudinally with reference vto the other the shaft 17 will be turned to change the setting of the cams 16 to advance or retard the time of contact of the cams 'with the plungers 14 or to maintain the same time of contact when the plungers' are regulated to vary thequantit of fuel delivered thereby.

In order to e ect movement of the sleeve 21 I provide the same with a collar 25 formed with a groove receiving the arms of a fork 26 fixedto a slidably mounted rod 27. Rod 27 is equipped at one end with a block 28 moving as a follower on a shaft 29 positioned below and parallel 'with the rod 27. Adjacent the follower 28 shaft 29 is equipped with a cam member 30 and an enlarged cylindrical portion 31 having a spiral cam groove 32 in which is engaged the free extremity of a finger 33 fixed to the follower. Cam 30 is in engagement with the free extremity of an arm 34 fixed to one extremity of the shaft 18.'

Movement of the sleeve 24 independently of sleeve 21 is effected through the instrumentality of a slidably mounted actuating rod 35 carrying a fixed fork 36 engaging a grooved collar 37.

At the end remote from the follower 28, shaft 29 is equipped with a spur gear 38 meshing with a toothed quadrant 39 fixed to one end of a lever 40. This lever is pivoted at an intermediate point on a pin 41 carried by suitable brackets 42 fastened to .the pump casing and the opposite extremity of the lever is secured by a connecting rod 43 to a piston 44 operating in a cylinder 45. This cylinder is supported byA suitable brackets 46 and is provided with a bottom inlet connected to an overflow pipe 47 leading from the relief valve 13. Adjacent its `oint of connection to the cylinder the over ow pipe 47 communicates with a by-pass 48 including a valve casing 49 containing a valve plug 50 controlling the passage of oil through the by-pass. In order to provide for the escape of excess pressure in the closed position of the valve, the by-pass 48 is provided with a relief passage 51 by-passing the said valve plug and normally closed by a relief valve 52.

The operation of the device may be briefly described as follows: The pressure plungers 1'1 function to supply oil to the reservoir in excess of the delivery capacity of the measuring plungers 14 so as to maintain the oil in the reservoir under a definite pressure governed by the relief valve 13. The excess oil escaping fromfthe reservoir passes through the overflow pipe 47 and, in the open position of the valve plug 50, through the by-pass 48 back to the tank or other source of supply. 'In starting the engine, the valve plug 50 is closed with the result that the oil escaping from the reservoir through the overflow pipe 47 will accumulate in the cylinder 45 and raise the piston 44 to the limit of its upward movement. During this movement of the piston to the top of its stroke, the shaft 29 and cam member 30 are rotated in a direction to raise the arm 34 of the shaft 18, consequently raising the arms 19 and the plungers 14 to position the latter for delivering a minimum quantity of fuel. When it is desired to increase the quantity of fuel delivered by the plungers 14, valve plug 50 is moved to open position through the medium of a suitable operating mechanism 50, thus permitting the oil to escape from the cylinder 45 to the tank or other source of supply. During this escape of the oil from the cylinder 45, the piston is caused to descend, being aided in this connection by a pair of springs 53 connected between a projection atthe lower end of the cylinder and a pin passing through lever 4() at a point intermediate quadrant 39 and connecting rod 43. During the descending movement of the piston, shaft 29 and cam 30 are rotated in a direction to lower the plungers 14 and thereby increase the .delivery capacity of the pump. At the same time the finger 33 operating in the spiraled cam groove 32 causes the sleeve 21 to slide relatively to the sleeve 24 thus changing the annular setting of the cams to compensate for the lowering of the plungers 14 in such manner as to maintain the same time of contact between the cams and the aforesaid plungers. It Will be understood in this connection that the extent of movement imparted to the piston 44 in either direction and consequently the setting of the cams 16 and plungers 14 is regulated by the movement of the control valve 50. When the valve 50 is closed with the piston 44 at the top of its stroke excess pressure developed in the overflow pipe 47 and the by-pass 48 is permitted to escape past valve 50 via relief passage 51 and relief valve 52.

When it is desired to change the time of fuel delivery without varying the quantity of fuel delivered, this is accomplished by longitudinal movement of the rod- 35, the fork '36 serving to move the sleeve 24 upon the sleeve 21 to-change the angular setting of the cam shaft 17 -without causing raising or lowering movement of the plungers 14.

What I claim as my invention:

1. Fuel feeding apparatus comprising a pump including a plunger, a movable shaft, plunger stroke regulating means controlled y movement of said shaft, a pressure responsive device, a drive connection between the pressure responsive device and saidA shaft and means other than the plunger for applying operating pressure to said pressure responsive device. 2. Fuel feeding apparatus comprising a pump including a plunger functioning to deliver measured quant-ities of fuel to an engine c 7linder, mechanism for regulating the delivery action of said plunger including a rotary shaft, a gear fixed thereto, a cylinder having a piston operating therein, a piston rod connected to said piston, an intermediately pivoted lever having one terminal secured to said piston and 'the other terminal equipped -an engine cylinder and mechanism for regulating the delivery action of the pump including a pressure responsive device actuated by the pressure of fuel delivered thereto from the reservoir.

4. Fuel feeding apparatus comprising a fuel reservoir, means for maintaining' therein a supply of fuel under pressure, a pump inl cluding a plunger' functioning to extract fuel from the reservoir and to deliver same to the Working cylinder of an engine, a pressure responsive device, means for conducting excess fuel from the reservoir to the pressure responsive device, means controlling' accumulation of fuel Within the pressure responsive device to regulate the effective action of said device and means including said pressure responsive device for governing the deliveryr action of the plunger.

5. Fuel feeding apparatus comprising a reservoir, a measuring pump functioning to ldeliver fuel from-the reservoir to the Working cylinder of an engine, means for supplying fuel to the reservoir in excess of the delivery capacity of the measuring pump, and mechanism for regulating the delivery action of the measuring pump including a pressure responsive device actuated by excess fuel de,- livered thereto from the reservoir.v

6. Fuel feeding apparatus comprising a reservoir, a measuring pump functioning to deliver fuel from the reservoir to the Working cylinder of an engine. means for supplying fuel to the reservoir in excess of the delivery capacity of the measuring pump, mechanism for regulating the delivery laction of the measuring pump including a pressure responsive device, a relief passage through which excess fuel is conducted from the reser- Voir to said pressure responsive device, and means controlling accumulation of the excess fuel within the pressure responsive device so as -to govern the action of the latter in accordance with engine requirements.

7. Fuel feeding apparatus comprising a reservoir, a measuring pump functioning to deliver fuel from the reservoir to the Working cylinder of an enginemeans for supplying fuel to the reservoir in excess of the delivery capacity of the measuring pump, a relief passage through Which excess fuel is permitted to escape from the reservoir, a valve in said passage and means for regulating the delivery action of the measuring pump including a pressure responsive device communicating with the relief passage ata point between the valve and the reservoir and adapted to be actuated by the accumulation of fuel therein, such accumulation of fuel being controllable by operation of said valve.

8. Fuel feeding apparatus comprising a reservoir, a measuring pump functioning to vdeliver fuel from the reservoir to the working cylinder of an engine, means for maintaining in said reservoir a supply of fuel under a deh'- nite pressure, said vmeans including a relief conduit through which excess fuel is conducted from the reservoir, a pressure responsive device for regulating the delivery action of the measuring pump including a cylinder having an inlet connection to said relief conduit and a piston operating in the cylinder and connected to the stroke regulating means of the measuring pump, and valve means controlling the passage of excess fuel through said relief conduit and operable to cause accumulation of such excess fuel within said cylinder to effect operation of the piston and a resulting change in the delivery capacity of the measuring pump.

In Witness whereof, I have hereunto set my hand.

ANDR C. ATTENDU. 

